test: Add bundle symbol extractor tool (#22002)

This tool will be used for extracting symbols out of bundles so that
we can assert that only whitelisted symbols are allowed.

PR Close #22002

packages/core/test/bundling/hello_world/BUILD.bazel

@@ -1,6 +1,7 @@
 package(default_visibility = ["//visibility:public"])
 
 load("//tools:defaults.bzl", "ts_library")
+load("//tools/symbol-extractor:index.bzl", "js_expected_symbol_test")
 load("//packages/bazel/src:ng_rollup_bundle.bzl", "ng_rollup_bundle")
 load("@build_bazel_rules_nodejs//:defs.bzl", "jasmine_node_test")
 
@@ -31,7 +32,9 @@ ts_library(
     name = "test_lib",
     testonly = 1,
     srcs = ["domino_typings.d.ts"] + glob(["*_spec.ts"]),
-    deps = ["//packages:types"],
+    deps = [
+        "//packages:types",
+    ],
 )
 
 jasmine_node_test(
@@ -44,3 +47,9 @@ jasmine_node_test(
     ],
     deps = [":test_lib"],
 )
+
+js_expected_symbol_test(
+    name = "symbol_test",
+    src = ":bundle.min_debug.js",
+    golden = ":bundle.golden_symbols.json",
+)

packages/core/test/bundling/hello_world/bundle.golden_symbols.json

@@ -0,0 +1,83 @@
+[
+  {
+    "name": "EMPTY$1"
+  },
+  {
+    "name": "NO_CHANGE"
+  },
+  {
+    "name": "Symbol$1"
+  },
+  {
+    "name": "__global$1"
+  },
+  {
+    "name": "__self$1"
+  },
+  {
+    "name": "__window$1"
+  },
+  {
+    "name": "_renderCompCount"
+  },
+  {
+    "name": "_root"
+  },
+  {
+    "name": "canInsertNativeNode"
+  },
+  {
+    "name": "createLNode"
+  },
+  {
+    "name": "createLView"
+  },
+  {
+    "name": "domRendererFactory3"
+  },
+  {
+    "name": "enterView"
+  },
+  {
+    "name": "executeHooks"
+  },
+  {
+    "name": "findFirstRNode"
+  },
+  {
+    "name": "getDirectiveInstance"
+  },
+  {
+    "name": "getNextLNodeWithProjection"
+  },
+  {
+    "name": "getNextOrParentSiblingNode"
+  },
+  {
+    "name": "invertObject"
+  },
+  {
+    "name": "isProceduralRenderer"
+  },
+  {
+    "name": "leaveView"
+  },
+  {
+    "name": "locateHostElement"
+  },
+  {
+    "name": "noop$2"
+  },
+  {
+    "name": "refreshDynamicChildren"
+  },
+  {
+    "name": "renderComponentOrTemplate"
+  },
+  {
+    "name": "renderEmbeddedTemplate"
+  },
+  {
+    "name": "stringify$1"
+  }
+]

packages/core/test/bundling/hello_world/treeshaking_spec.ts

@@ -18,10 +18,8 @@ import * as domino from 'domino';
 
 describe('treeshaking with uglify', () => {
   let content: string;
-  beforeAll(() => {
-    content = fs.readFileSync(
-        path.join(process.env['TEST_SRCDIR'], PACKAGE, 'bundle.min_debug.js'), UTF8);
-  });
+  const contentPath = require.resolve(path.join(PACKAGE, 'bundle.min_debug.js'));
+  beforeAll(() => { content = fs.readFileSync(contentPath, UTF8); });
 
   it('should drop unused TypeScript helpers',
      () => { expect(content).not.toContain('__asyncGenerator'); });